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81 Cards in this Set
- Front
- Back
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Which week in development does the dental lamina form?
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Week 5
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Dental lamina budding is induced by________________?
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mesenchymal neural crest cells
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The dental lamina is formed by the involution of what type of cells?
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epithelial
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The bud stage is in what week of development?
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Week 8
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The cap stage is in what week of development?
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Week 9
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The vestibular lamina develops (adjacent to/within) the dental lamina?
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adjacent
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The dental papilla is formed by an unequal growth of what cells?
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epithelial cells
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Which structure extends from the dental lamina during the cap stage?
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the enamel organ
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The _________________ surrounds the enamel organ.
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dental sac
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____________ occurs in the bell stage.
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Cytodifferentiation
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The enamel organ is surrounded on the inside by the ________________ and on the outside by __________________.
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inner enamel epithelium; the outer enamel epithelium
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Which layer lies next to the inner enamel epithelium?
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stratum intermedium
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The _____________ comprises the center of the enamel organ.
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stellate reticulum
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What is the purpose of the stellate reticulum?
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To protect the developing tooth
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What is the purpose of the successional lamina?
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To form the secondary tooth
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From what is the successional lamina formed?
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from the dental lamina
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The cervical loop is formed at the junction of which two structures?
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The inner and outer enamel epithelia.
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What is the purpose of the stratum intermedium and where is it located?
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It is located adjacent to the inner enamel epithelium and serves to nourish pre-ameloblasts and ameloblasts.
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The inner enamel epithelium will become which cells?
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ameloblasts
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Preameloblasts in the inner enamel epithelium are (more/less) differentiated towards the cervical loop?
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less
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What initiates the differentiation of odontoblasts?
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preameloblasts
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Odontoblasts arise from the (dental papilla/dental sac)?
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dental papilla
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What is an odontoblast called before it begins to secrete dentin?
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preodontoblast
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What is the difference between predentin and dentin?
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predentin is not mineralized
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T or F: Like predentin, enamel is non-mineralized when it is formed?
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False, it is partially mineralized
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The secretion of predentin causes differentiation of what cells?
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preameloblasts to ameloblasts
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The reduced enamel epithelium is formed by the collapse of what structure?
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the enamel organ
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the reduced enamel epithelium covers the tooth through ____________?
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eruption
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T or F: The reduced enamel epithelium is avascular?
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False, it is surround by many capillaries
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What is immature enamel?
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It is the enamel which is secreted and is only partially mineralized.
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What structure thickens between the preodontoblasts and the preameloblasts?
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basement membrane
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Preodontoblasts send out __________ which will come in close contact with _____________?
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processes; preameloblasts
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The nuclei of preameloblasts and preodontoblasts move (towards/away from) the secretory end of the cells?
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away from
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What portion of the ameloblast cell is responsible for the secretion of ename.?
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tome's process
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Ameloblasts secrete (dentin/enamel)?
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enamel
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T or F: When the ameloblast stops secreting enamel, it loses its tome's process and replaces it with a striated border?
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True
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During the maturation stage of enamel, what is lost?
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organic material and water
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What is the function of the striated border of the ameloblast?
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To resorb organic material and water from immature enamel
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T or F: In a primary tooth, the incisal portions of the tooth are more calcified at eruption?
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False, there is an even distribution of calcification in primary teeth.
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In permanent teeth, there is an (even/uneven) distribution of calcification?
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Uneven, incisal edges are more calcified (this is NOT true for primary teeth)
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Hydroxyapatite crystals run (obliquely/parallel) in the rod core and (obliquely/parallel) in the rod sheath?
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parallel;obliquely
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In maturing enamel, hydroxyapatite crystal become (thicker/thinner)?
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thicker
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When does root formation begin?
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After the crown is fully competed
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The epithelial root sheath is an extension of what structure?
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the enamel organ
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The epithelial root sheath induces the differentiation of what cells?
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odontoblasts to form root dentin (remember that crown odontoblasts are induced by preameloblasts)
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The inward turning of the apical portion of the epithelial root sheath is called __________________?
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the epithelial diaphragm
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The dental papilla become the ___________?
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pulp
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The epithelial root sheath is composed of what two layers?
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inner and outer enamel epithelia
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Upon induction of the odontoblasts and root dentin formation, the epithelial root sheath does what?
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disintegrates and forms epithelial rests
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What are epithelial rests?
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small groups of epithelial cells which remain around the root
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As the epithelial root sheat disintegrates, cells from the dental sac migrate into this space and become _______________?
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cementoblasts
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The first layer of dentin is called ___________ dentin, while subsequent layers are called ______________ dentin.
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mantle,circumpulpal
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_____________ dentin is a small layer between _____________ dentin and _______________ dentin?
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globular, mantle, circumpulpal
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Globular dentin is (more/less) mineralized than other types of dentin?
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less
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Enamel and dentin are first formed in the (cuspal/cervical) region of the tooth?
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cuspal
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What are A and B?
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A - dental lamina
B - mesenchymal neural crest |
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What stage?
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Bud stage
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What are A-E?
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A-enamel organ
B- dental lamina C- vestibular lamina D- dental papilla E- dental sac |
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What stage is this?
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Bell
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What are A-G?
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A- inner enamel epithelium
B- outer enamel epithelium C- stellate reticulum D- successional lamina E- dental lamina F- dental papilla G- dental sac |
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What are A-E?
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A- cervical loop
B- inner enamel epithelium C- outer enamel epithelium D- stratum intermedium E- stellate reticulum |
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What are A-C?
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A- cervical loop
B- least differentiated ameloblasts C- most differentiate ameloblasts |
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What are A-D?
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A- preameloblasts
B- preodontoblasts C- stellate reticulum D- dental papilla |
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What are A-E?
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A- odontoblasts
B- predentin C- ameloblasts D- enamel E- dentin |
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What are A-C?
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A- reduced enamel epithelium
B- mature/protective ameloblasts C- capillary |
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What are A and B?
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A- ameloblasts
B- immature enamel |
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What are a-c?
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a- preodontoblast
b- preameloblast c- basement membrane |
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What are a-c?
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a- odontoblast nucleus
b- secretory end of odontoblast c- predentin |
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What are a-c?
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a- ameloblast nucleus
b- enamel c- tome's process |
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What kind of cells is this?
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preodontoblast
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What kind of cell is this?
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ameloblast
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What kind of cells is this?
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maturative ameloblast (dense granules present)
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What are a-d?
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a- striated border
b- immature enamel c- mature enamel d- dense granules |
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what are a and b?
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a- enamel
b - dentin |
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What is a?
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hydroxyapatite crystal
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what are a and b?
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a - rod sheath
b - rod core |
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what are a-f?
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a- epithelial diaphragm
b- radicular pulp cavity c- dentin d- enamel space e- alveolar bone f- root |
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what are a-f?
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a- radicular pulp cavit
b- dentin c- dental sac d- point of epithelial root sheath disintegration e- epithelial diaphragm f- epithelial rests |
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what are a-c?
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a- cementoblasts
b- odontoblasts c- predentin |
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what are a-d?
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a- epithelial rests
b- mantle dentin c- globular dentin d- circumpulpal dentin |
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what is a?
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dentin deposition on mesiobuccal cusp
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